Limited-range spotlight



NOV. 13, 1928. I A. c. woon LIMITED RANGE SPOTLIGHT Filed May 5, 1927 3 Sheets-Sheet l V wwwmmww A. C. WOOD LIMITED RANGE SPOILGAHI'Il Nov. 13, 19282 Filed May 5, 1927 3 sheets-sheet 2 IIIIIIIIIIII-Illl Nov. 13, 1928.

yA. C. WOOD LMITEIDv RANGE SPOTLIGHT Filfed May 5, 1927 3 Sheets-Sheet 5 Patented N ov. 13; 1928.

11,691,42u ATI-IN'IV0F12ICE.Y

ANDREW o. woon, or omesso, iLLiNois, Assieiioa yTo STEWART-WARNER sPEEu f oneri-ia ooaroaariou, or CHICAGO, immers, A CORP-ommen or vmemia.

Limmen-Reiten sroTLIGH'r.

Application flied `Mayk 5,

The purpose of this invention is to provide 'a construction of vehicle-mounted seerchlight or spotlight for the purpese. of insuring automatic extinguishment of the lightv when the lamp is directing beam within certain prohibited angular ranges vertical hori- Zontal. it consists in the eiements and features of construction shown'and described as indicated in the claims.

In the drawings Figure 1 lis a partly ing this invention. K f

Figure 2 is a rear elevation of the same.

Figure 3. is a, verticai section axial with respect to the lamp and its stem at the plane indicated by line '3-3 on Figure 2, on an enlarged scale, I

.Figure 4 is a section axial with respect to the stem as at the'line 4.-4 on AFigure 8. l

Figure 5 is a perspective view oi one of the ciremt-interrupting cams.

Figure 6 is a Iliainetric section oi the same as at the line 6 6 on Figure 3, said cam being shown on the pivot bolt which carries it.

Figure 7 is a partly sectional elevation of the other. cam and its stem, section. being axial with respect to the latter.

Figure 8 is a `section at the line 8 8 on Figure?. 'A

Figur-e 9 isa perspective view Vof an insulating key whichholds the parts shown in Figure 7 to the stem of the lamp body tor rotationtherewith. p l

'Figure 10 is an elevation of a bolt which forms the pivot stem of the lamp body.

Figure 11 is a section at the line A11-11 on Figure 10.

Figure 12 is anend view of said bolt. Figure 13 is a section at the line 18%13 on Figure 4 for showing a irictioning and ad-Y justing plate provided for connecting the.

lamp body adjustably with its pivotstem.

Figure 14 is an elevation of said frictioningand adjusting plate looking in the direction of the arrow 14 on Figure 13. Figure 15 is a section at the line on Figure 14v l In the drawings, irepresents a body member construction, in that it comprises `a casing, 11,0, containing a reflector, and a lamp socketindicated at 11 for holding an electric lamp, 12. T his lamp body,7 has at the rear a handle, 13, by which it may be adjusted in its supports, The supports comprise two sectional side elevation of the lamp having mountings embody- Y 1927. *seriall No. 188,921,`

Y mediate member whichv is pivoted to vthev other two is indicate-d at 16, its pivotal connection to the member, 15, inthe particular position otmounting shown in the drawings being the horizontal pivotoonsisting of the pivot bolt, 17, which extends through two parallel lugs, a, 15", projecting from the basev of' the member, l15, and through two interven.-V ing lugs, 16, 16, which project from the body portion of said second or intermediate member. 16, and is arranged to be made fast ,to the iixedfsupportin'g member, 15',.by av cap nut, 17"', clamping said boltv tightly t-o the lugs, 15a.

The lamp body, 10, is provided with a mounting bracket, 10",'which isvbolted rig.- idly to and constitutes substantiallya partof said body and comprises a short'cylindrical body portion 18 which terminates in a down-V wardly facing shoulder at 20 and which has a centrally positioned downwardly projects ing stem, 21, consisting of a hollow bolt screwed into thebraclret at the center of they downwardly facing shoulder, 20, andwhich 1 is further made fast to the bracket' by a jam nut, 22, andan intermediate washer, 23, both applied inside the lamp casing, 10. Said stem, 21, constitutes the pivotal terminal'of the bracket and it has a head 24 stopped kat its lower endbelow a shoulder- 25, which is the upper end of the downwardly open cylindrical recess, 26, formed between the 'downwardly extending lugs, 16216, of the memf. ber, y16, and the upper end of said member, 16, is vfinished for making and seating thev lowerjend of the part 10", with an intervening washer, 27. A spring washer, 28, is interposed between the head, 24, of the pivot stem, 21, and the shoulder, 25, said spring washer beingY dimensione-d for being put under substantial tension by screwing'the stem, 21, into the part,

19, as shown, so thatby reaction of the spring washer,.the two parts 16 and 10X are frictionally engaged at the annular areas of their mated ends around the pivot stein, 21, by

' having interposed between said Vmat-ed surfaces for the purpose of avoiding the necessity of finely iinishing the latter cooperating friction members, 30 and 31, the part, 3G, be ing an annular steel disk with an upturned lug, 30a, at one side by wliichit is secured by screw, 30h, to the part, 10X, and the part, 31, being a fiber washer.

Through the hollowpivotal stem, 21, there is extended anV electriccircuit member consisting of a metal rod, 33, which is insulated from the pivot stem,-21, by an insulating sleeve, 84, which serves not only for insulation, but at the same timel assists the key construction hereinafter described in render-v ing the rod, 33, rigid with the stem, 21, which inturn is made fast` as described forrotation with the lamp body.

At the outer end of the conductor rod, 33, there is mounted fixedly with respect to said rod a contact member, 35, which is in the form of an inverted cup, and on the bolt. 17, which constitutes the pivot of the second or intermediate member, 16, to the Afirst or vehiclesupported member, 15, there is mounted ,insulatedly, and rigidly with respect to said pivot bolt, 17, a disk, 36, diametered and positioned alongr the axis of the bolt for intersection of its circumferential edge with the inner circumferential edge of the flange wall, 35a. of the cup-shaped contact member, 35, which the periphery of the disk, therefore, inter.- sects for contact at two points, which in View of the central position of the disk i on the pivot bolt` 17, as shown, are diametrically opposite each other on the edge of the cup flange. Said cup flange has aninterruption in its circumferential periphery caused by a notch, 35h, in said flange edge; and the disk, 36, has an interruption in its circumferential edge i at the short segment, 36a, said interruptions having angularextent in the parts to which they pertain corresponding respectively to the horizontal and vertical anglesof adjust ment withink which the. lamp is to be eX- tinguished.

, The lamp-energizing circuit comprises an inleading wire. 40, for which entrance is provided axially of the pivot bolt, 17, as seen at 17m, the axial cavity having a radial out-V lead at 17 n, between the journals at which the lugs, 16a, 16a, obtain bearing u pon said pivot bolt, and the end of the wire, 4:0, is attached to rthe side or edge of the disk, 36, necessary slack being provided to accommodate easy adjustment of the parts in assembling.'

From the above description it may 'be understood that except when the lamp is adjusted within the prohibited vertical and horizontal angles, the circuit for energizing the lamp comprises from the inleading wire, 40, the disk contact member, 36, the cup- EIS - at 45; and it may be understood that the lampl is grounded or the circuit completed to vthe I other pole of the scurce of electric energy, in respect to which theV construction is not shown. It will also be understood Vthat the return or ground side of the circuit. coml prises (a) thewire seen at 60 attached by binding screw to the lamp socket and at any convenient point to the lamp body,'10, as in-V dicated at 61, (Zi) the metal parts comprising the mounting in metallic contact at their successive pivots to each other, containing said return or ground side of the circuitthrough the first of said three members, the

mounting bracket, l15, and (c) a wire, 63,se cured by binding screw to said mounting bracket as seen at 64, said wire, 63, extending either to a met-al part of the vehicle or to the proper pole of the source ofelectric energy.

`t-will be understood that this wire,68, is embodied in the return course of the circuitY by reason of the circumstance that the brackfY et, 15, may be mounted upon some wooden part of the vehicle so that the circuit return would be interrupted by the insulation produced by such wooden support.` l Certain details of the construction warrant iarticular description. Y The contact disk member, 86, is specially `constructed for facilitating` its insulated mounting on the pivot bolt,17, and its adaptation for serving the function of transmitting the current by cont-act at its periphery wit-hv the cup-shaped contact linember, the same A being for this purpose ',made comprising a disk, 35X, of insulating material such as bake'- lite or Vsimilar hard insulating substance,l

which is enclosed ina sheet metal stamping, By, into which the disk, 35X, is forced, being dimensioned for a forced fit therein, while the stamping, 35y, is in thefform of aflanged annulus after which its said flange, 352, is clinched over the margin' of the disk. rlhe construction as thus described may be understood clearly from Figures 5 and 6, fromV which also it may be understoodthatr the device thusformed isv mounted non-rotatablyv with respect to the pivot bolt by having the central aperture, 36W, of the Vbakelite member, 36X, formed with a flat as seen at 36p, which Vregisters with a corresponding flat,'171, on

iid

said forkl ends may be entered the. central y aperture of the cup-shaped conta-ct member, 33, and then spread to engage the. edges of the aperture in the remnant of thel groove, 33,

in the outer side of said -fork ends;l and the, insertion of a key, 37, of insulating material as balelite in the registered slots of the stem,

21, and rod, 33, secures the parts and particularly the rod, 33, and the. stem, 35, in a manner avoiding electrical connection between them. To insure against the possibility of conductive contact ybetween lthe periphery of thedisk, 36, and the e-ndl of the rod, 33, an insulating disk, 35C, is fitted in the bottom ofthe cup closely seated thereon and against the end of the rod, 33, and additionally retained by. pricking the cup member at a plurality of points in its circumference to form'inwardly protruding slight bosses, 35d, which project under the edge of the insulating disk 35C.

For insuring electrical insulation ofthe member, 35', from the head of the stein, 21,

' there is provided an insulating washer, 47,

mounted on the end of the rod, 33, which protrudes from the stem 21; and for holding thev cup-shaped member, 35, down into assured contact of its peripheral flange with the periphery of the disk, 36, there is interposed between the lower side of the washer, 47, and the upper side of the cup member, 35, a spira-lly coiled spring, 43, adaptedto becompressed into nearly Hat form, that is, with its coils one within another, the inner coil seating upon the upper side of the cup-shaped member, which for seating and centering it is formed with a slight upstruck boss, 35S.

The purpose of the construction as a whole being to adapt the lamp for adjustment so as to be automatically extinguished within certain prohibited angular ranges, it is desirable to be able to adju-st the lamp body on the intermediate menrber angularly about the vertif al pivot so that the prohibited angular range may correspond to the desired zone of the roadway on which illumination is prohibited. For this purpose the engagement of the hollow bolt, Q1, which constitutes the pivot stem of the lamp body to the intermediate member, 16, is effected by utilizing for that purpose and as an adjusting plate the part, 30, above designated as frictioning plate.

'The construction vof this detail may be understood from Figures 10 to 15 inclusive, as Will now be described The hollow bolt, 33, which constitutes the stem of the lamp body is segmentally flattened at opposite sides at thev l.

upper endportion vfor engaging lnon-rotatably a corresponding shaped aperture, 30m, in the frictioning and adjusting plate 30. The boss, 18, of -the bracket, 10",*has acircular aperture for receiving said flattened 'end'por-y tion of the bolt, andthe adjusting plate,30,

ference of the boss, 18, and an elongatedslot, 30, in saidflangef for a Yclar'nping' bolt, 37, which is ,screwed vinto the boss and by its head, 37, outside the flange, 3Q, serves Vfor clamping the adjusting plate, 30, to the'boss and thereby to the lamp body at any selected posi# tion of? adj ustmentl within lthe range of; the

' slot, 30. i Y

I claim y '1; An illuminating combination three co-operating members of a light support pivoted successivelyto one another, the first member being a fixed support, the last member being a lamp body, the axes of the pivotal connections of the second member to the other two being intersecting; a circuit for energizing a lamp to be mounted in the lamp body extending through said three members and comprising annular conductive areas of two of said members extending about the two axes respectively, each Vof said annular areas having an interruption of limited angular extent atwhose coincidence only in the adjustment about said axes, the circuit is interrupted.

2. In the construction defined in claim 1, the annular conductive areas being on parts rigid with the lamp body and the fixed support respectively.

3. In the construction defined in claim 1, the members having said annular conductive areas being, one, a cup-shaped part of which the conductive area is the margin of the cup wall or flange, the interruption being -produced by a notch in the edge of said flange, the part having the other annular conductive area being a disk of which the conductive area is a peripheraled e, the interrup-v tion therein being formed by a limited recession of said edge from the circle definingit. n f

4. In the construction defined in claim 1, the member having one of the annular conductive areas being formed for intersection of its conductive area at two points thereof with the other annular conductive areas, said two points being angularly separated more widely than the angular extent of the convtact-interrupting feature of the other annu-- lar area.

5. In the construction defined in claim 1, the parts having the annular conductive areas being one a cup-shaped part of which the conductive area is a margin of a cup wall or flange, the part having the other annular conductive area being a disk at which the conductive areais a peripheral edge, the interhas a flange, 30, upturned `outside the. circum-` device j comprising in l angularly separated more AWidely than ther angular extent of the recession in the edge of the disk. Y

6. In the construction defined in claim 1, the parts having the annular l conductive areas being one a cup-shaped part of whichV the conductive area is a niargin of the cup Wall or flange, and the other a disk of which the conductive area is its peripheral edge.

7. In the construction defined in claim l, the-pivot of the intermediate of the three members'to theY first inernber having a longii April, 1927.'`

tudinal cavit leadin in from an exteriorl exposed end thereof` opening radially i of said pivot, the inlet Wire othe energizing circuit being entered throughsaid cavity for attachment to the interior circuit connec-v tions.

8. In the constructioi'i'deined in claim: l,r

the part rigid With the lamp body havingthe annular conductive area being secured to the lainp body With a limited range'of adjust y ment angularly about the axis of the pivotal Connection of the lamp body With the intermediate meniber.

inyhand at Chicago, Illinois, this 2S day 0f ANDREW'C. Woon;

In testiinoiiywhereof, I have hereunto set 

